| // Copyright (C) 2019 Leo Balter. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-weak-ref.prototype.deref |
| description: WeakRef deref should not prevent a GC event |
| info: | |
| WeakRef.prototype.deref ( ) |
| |
| ... |
| 4. Let target be the value of weakRef.[[Target]]. |
| 5. If target is not empty, |
| a. Perform ! KeepDuringJob(target). |
| b. Return target. |
| 6. Return undefined. |
| features: [WeakRef, host-gc-required] |
| includes: [async-gc.js] |
| flags: [async, non-deterministic] |
| ---*/ |
| |
| var deref = false; |
| var wr; |
| |
| function emptyCells() { |
| var target = {}; |
| wr = new WeakRef(target); |
| |
| var prom = asyncGC(target); |
| target = null; |
| |
| return prom; |
| } |
| |
| emptyCells().then(function() { |
| deref = wr.deref(); |
| assert.sameValue(deref, undefined); |
| }).then($DONE, resolveAsyncGC); |